Intel 386 User Manual page 570

Table D-1. Peripheral Register Addresses (Sheet 5 of 6)
Expanded PC/AT
Address Address
F4F8H 03F8H
F4F9H 03F9H
F4FAH 03FAH
F4FBH 03FBH
F4FCH 03FCH
F4FDH 03FDH
F4FEH 03FEH
F4FFH 03FFH
F800H
F804H
F820H
F822H
F824H
F826H
F830H
F832H
F834H
F836H
F860H
F862H
F864H
F868H
F86AH
F86CH
F870H
F872H
F874H
NOTES:
1. Byte pointer in flip-flop in DMA determines which register is accessed.
2. Shaded rows indicate reserved areas.
Access Type
(Byte/Word)
Asynchronous Serial I/O Channel 0 (COM1)
Byte
Byte
Byte
Byte
Byte
Byte
Byte
Byte
Clock Generation and Power Management
Byte
Word
Device Configuration Registers
Byte
Byte
Byte
Byte
Byte
Byte
Byte
Byte
Parallel I/O Ports
Byte
Byte
Byte
Byte
Byte
Byte
Byte
Byte
Byte
SYSTEM REGISTER QUICK REFERENCE
Register Name
RBR0/TBR0/DLL0
IER0/DLH0
IIR0
LCR0
MCR0
LSR0
MSR0
SCR0
PWRCON
CLKPRS
P1CFG
P2CFG
P3CFG
PINCFG
DMACFG
INTCFG
TMRCFG
SIOCFG
P1PIN
P1LTC
P1DIR
P2PIN
P2LTC
P2DIR
P3PIN
P3LTC
P3DIR
Reset Value
XX/XX/02H
00H/00H
01H
00H
00H
60H
X0H
XX
00H
0000H
00H
00H
00H
00H
00H
00H
00H
00H
XX
FFH
FFH
XX
FFH
FFH
XX
FFH
FFH
D-5